1 /* 2 * Copyright (c) 2000, 2023, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_GC_SHARED_MODREFBARRIERSET_HPP 26 #define SHARE_GC_SHARED_MODREFBARRIERSET_HPP 27 28 #include "gc/shared/barrierSet.hpp" 29 #include "memory/memRegion.hpp" 30 31 class Klass; 32 33 class ModRefBarrierSet: public BarrierSet { 34 protected: 35 ModRefBarrierSet(BarrierSetAssembler* barrier_set_assembler, 36 BarrierSetC1* barrier_set_c1, 37 BarrierSetC2* barrier_set_c2, 38 const BarrierSet::FakeRtti& fake_rtti) 39 : BarrierSet(barrier_set_assembler, 40 barrier_set_c1, 41 barrier_set_c2, 42 nullptr /* barrier_set_nmethod */, 43 nullptr /* barrier_set_stack_chunk */, 44 fake_rtti.add_tag(BarrierSet::ModRef)) { } 45 ~ModRefBarrierSet() { } 46 47 public: 48 template <DecoratorSet decorators, typename T> 49 inline void write_ref_field_pre(T* addr) {} 50 51 template <DecoratorSet decorators, typename T> 52 inline void write_ref_field_post(T *addr) {} 53 54 // Causes all refs in "mr" to be assumed to be modified (by this JavaThread). 55 virtual void invalidate(MemRegion mr) = 0; 56 // Causes all refs in "mr" to be assumed to be modified by the given JavaThread. 57 virtual void write_region(JavaThread* thread, MemRegion mr) = 0; 58 59 // Operations on arrays, or general regions (e.g., for "clone") may be 60 // optimized by some barriers. 61 62 // Below length is the # array elements being written 63 virtual void write_ref_array_pre(oop* dst, size_t length, 64 bool dest_uninitialized = false) {} 65 virtual void write_ref_array_pre(narrowOop* dst, size_t length, 66 bool dest_uninitialized = false) {} 67 // Below count is the # array elements being written, starting 68 // at the address "start", which may not necessarily be HeapWord-aligned 69 inline void write_ref_array(HeapWord* start, size_t count); 70 71 protected: 72 virtual void write_ref_array_work(MemRegion mr) = 0; 73 public: 74 // The ModRef abstraction introduces pre and post barriers 75 template <DecoratorSet decorators, typename BarrierSetT> 76 class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> { 77 typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw; 78 79 public: 80 template <typename T> 81 static void oop_store_in_heap(T* addr, oop value); 82 template <typename T> 83 static oop oop_atomic_cmpxchg_in_heap(T* addr, oop compare_value, oop new_value); 84 template <typename T> 85 static oop oop_atomic_xchg_in_heap(T* addr, oop new_value); 86 87 template <typename T> 88 static void oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw, 89 arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw, 90 size_t length); 91 private: 92 // Failing checkcast or check null during copy, still needs barrier 93 template <typename T> 94 static inline void oop_arraycopy_partial_barrier(BarrierSetT *bs, T* dst_raw, T* p); 95 public: 96 static void clone_in_heap(oop src, oop dst, size_t size); 97 98 static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) { 99 oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value); 100 } 101 102 static oop oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value) { 103 return oop_atomic_xchg_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), new_value); 104 } 105 106 static oop oop_atomic_cmpxchg_in_heap_at(oop base, ptrdiff_t offset, oop compare_value, oop new_value) { 107 return oop_atomic_cmpxchg_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), compare_value, new_value); 108 } 109 110 static void value_copy_in_heap(void* src, void* dst, InlineKlass* md); 111 }; 112 }; 113 114 template<> 115 struct BarrierSet::GetName<ModRefBarrierSet> { 116 static const BarrierSet::Name value = BarrierSet::ModRef; 117 }; 118 119 #endif // SHARE_GC_SHARED_MODREFBARRIERSET_HPP